However, this formation scenario is in contradiction with the one proposed by [1]}: in fact, these authors found disky isophotes in their central regions of BCGs, in contrast with most BCGs in non-fossil systems [2]}. This result seems to favour a scenario in which mergers in FGs were rich in gas, thus including large M\(^*\)  spirals. A similar result was found also by [3]}, since they found many shells around central galaxies in FGs. These shells are likely formed recently via major mergers of spiral galaxies [4]}.
